Furnace for burning powdered fuel



March 312, 192

7 1,532,103 KRAEMER FURNACE FOR BURNING POWDERED FUEL Filed July 5, 1922 d/ a 'iBLg M a o I minus clered fuel in the furnacechamher;

surface of the openin ,a. in the front 9 Patehtecl Mar. i925. uurrsn MILTON KRAEMER, 0F

NEW 1033, N. 53X, ASEiIG-NOR OTEQHE-EALF T0 EDWARD A.

GEOGHEGAN, OF NEW YGREZ, 33?.

FOB, BURNING lI-iilWDIlFlltEd'fi FUEL.

Application filed July 3,

'1'0 all v /10m it away concern:

' Be it known that LMIL'roN KnAnMnR, a citizenof the United States, residing at New York, in the county of New York and State of New York, have invented certain new and useful Improvements in. Furnaces for Burning Powdered Fuel; and I do hereby declare the following to be a full, clear, and exact-description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon, forming part of this specification. h i

This invention relates to furnaces for burning powdered fuel, and particularly to such furnaces for steam generators. I

The object of this invention is to provide for'theintroductionof suliicientheated air into the semicylindrical furnace chamber to produce complete combustion of the pew- The features of my invention are herein after described and pointed out,-and are il-. lustrated in the accompanyingidrawings in which p Figure 1, is a vertical section of'a vertical water tube boilersetting showing my 1nvention installed therein. p I

, Figure 2, .i's'a like view of a furnace chamber constructed according to. my invention for a horizontal Water-tube boiler.

Figure 3 is a plan view of one of the draft controlling slides.

ln these drawings A. is the base of the setting; A is the vertical fire wall at the rear of the semicylindrical furnace chamber. B, having in the .loase thereof a transverse air draft duct a, from which vertical slots or ducts a lead upwardly through the fire Wall to the upper end thereof. The front fire wall A is preferably curved as shownat a, so as to throw the flames forwardlyat the u per partoffthe chamber- B. I". also preeraoly make an f the fire wallA' from tie d'ucta' g In Fig. 1, the furnace 'cl'iamber B is" provided with an n per inclined Jwall and projecting fromt e-underside offthefupper; inclined wall C is a deflecting wall G which extends into the furnace'chamber' B' sulliciently to cause the to impinge aga nst the camel frontysurtace a? of. the

' vide a series of air draft jets E through thev air supplying slots or ducts 0 c and-E 1 B. C indicates a vertical. front wall ofv 192a Elcrial ensa.

fire wall A. The deflecting wall G" is pro vided with an air duct 0 which extends downwardly in said Wall from "the upper 1 surface of the cover C and preferably turns and opens through the rear side of the it A fiector G. a p '1 also preferably provide an. an liary air drz'zft slot or opening '0 lathe upper wall C in: front the rlellec or G to supply air when needed. l) indicates apowtiered fuel feeding apparatus of ordinary construction,- from which a spout (3 extends through the inclined upper wall 0 into the senii'cylindrical furnace chamber Etinfrcnt of the deflector C, the exit endtl" of the spout (I being bent suiiicie'ntly to throw the fuel to: ward the fire wall A. I also preferably profurnace wall, having the exit ends thcrco' adgacent tothe exit ends. clef t spout (Z. .l. preferably provide eachcf' e controlling slides or valves l F, and l so that the air drafts can be regulated. as desired. In Fig.2 my invention is shown adanted for use/1n association with a horizdntal] water tube boiler. In this na ure the .l wall A1 at the rear of the se.iiic lindrical furnace chamber l3, provided with curved front surface 1- A transverse air chamber a is located. near the base thereof froni which an air duct (1. extends uiawardlv and opens through the top of said wall so that .air travelling upwardly therethreugh becomes heated. before it enters the combustion chamber. From the duct a there is a branch opening a through the front surface of the fire wanna the furnace chamber" the furnace chamber, and. pro e'eti'ng iii-- wardly from said wall 15 a deflect r Wall C"; hrough .'Wll1(3ll there is an air passage v,

througlrwhi'ch air may flow and D indicates a fuel feeding apparatus from which a fuel ductleads. intothe lower I a ibeconieif heated before it IS d scharged theref imr ntotlie combustion chamber.

- to control the volume of air admitted to the air passage cand c.

In operation the flames produced by the burning of powdered fuel injected into the chamber B or B through the nozzle (13 or d are projected toward the curved front face a or a of the fire wall A. or A which heats the same so that the air flowing through the draft duct 0. or a becomes heated before it is delivered from the upper end thereof; likewise the flames cause the deflecting wall C or C to become heated, thereby causing the air flowing through the draft duct 0 Or 0? to become heated before its delivery into the chamber B or B. Air

flowing into the chamber B or B through air jet E or E is delivered adjaceut to the end of the nozzle (1 or at of the spout cl or (i so that the flames from the nozzle is projected toward the deflector C or C and fire walls A' 01' A The air is drawn through the several air ducts by means of the ordinary draft from invention; therefore What I claim as new' and desire to secure by Letters Patent is 1- 1. In an apparatus of the class described,

a semi cylindrical combustion. chamber with the axis thereof transverse of the furnace structure said chamber extending from side wall to side wall of the structure andwhaving an openingtherefrom to the boiler space parallel with said axis, a wall projecting into said chamber to a point adjacent to 1 said axis, means to supply fuel to said chamber below said Wall, and means to admit air to said openin z,

2. In an apparatus of the class described, a semi-cylindrical combustion chamber having its axis transverse to the furnace structure, the rear Wall of said chamber having an air passage therein adjacent to, and adapted to discharge air through the front surface thereof, said chamber having an opening -therefroin to the boiler space parallel with the'axis of said chamber, an inclined wall above the axis of said chamher and forming the roof thereof, a deflecting wall extending from said inclined wall into said chamber to a point adjacent to said axis and having an air passage therein to discharge air'into said opening, and

means to supply fuel to said chamber below said deflector and in front of said axis.

3. In an apparatus of the class described, a semi-cylindrical chamber having the axis thereof transverse of the furnace structure and having an opening therefrom to the boiler space parallel with said axis, said chamber extending from side wall to. side wall of the structure, a radial deflector wall projecting into said chamber to a point adjacent to said axis and having an air inlet passage therethrough adapted to discharge heated air into the opening from said chamber, and means to supply fuel to said chamber below said deflector wall.

4, In an apparatus of the class described, a chamber extending from side wall to side wall and having a rear wall provided with a semi-cylindrical curved front surface with the axis thereof transverse to the furnace structure and having an air passage therein adjacent tosaid front surface,'and adapted to, discharge heated air into said chamber, a deflector wall projecting into said chamber to a point adjacent to the axis thereof whereby the products of combustion Will be deflected toward said rear wall, and means to supply fuel to said chamber under said deflecting wall.

In testimony whereof I afiix .my signature.

Mrrroa KRAEMER. 

